class 4_1 {
	int weight =1;
     }
class Lake {
	Fish fish;
	void setFish (Fish s){
	fish=s;
}
	void foodFish (int m) {
	fish.weight =fish.weight+m;
	}
}
	public class xiti1 {
	public static void main (String args[]) {
	Fish redFish =new Fish();
	System.out.println(redFish.weight);
	Lake lake=new Lake();
	lake.setFish(redFish);
	lake.foodFish(120);
	System.out.println(redFish.weight);
	System.out.println(lake.fish.weight);
}
}